= Control bus
The <computer bus> paths specifying operations and coordinating progress, including requests and acknowledgments. Some control travels from initiator to target and some returns. In the diagram, <bus arbitration> requests and grants are shown separately from transfer control to distinguish choosing an initiator from executing its <bus transaction>.<CS152: Computer Architecture and Engineering, Fall 1999/Lecture 21: Buses and I and O>[CS152 lecture 21, slides 22 and 33–36: control signals, sequencing, request and grant]{ref}
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